Yes, there are quite a few out there. You can start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'Deku and Uraraka kiss' and you'll likely find some interesting stories.
In 'Deku and Uraraka kiss fanfiction', a prevalent theme is the exploration of their emotions. This includes the shy and hesitant feelings they might have towards each other. Their innocent and pure love is also a common theme. Many fanfictions also focus on the setting, such as a quiet moment in the schoolyard or a special event at the hero academy that sets the stage for their kiss. Additionally, the theme of support, where they encourage each other in their heroic pursuits and that support leads to a deeper emotional connection and ultimately the kiss, is often seen.
Uraraka and Deku do get together in the manga. It happens as their friendship deepens and they face various challenges together, leading to a romantic connection.
Typically, these fanfics often focus on their relationship, whether it's friendship or a budding romance. They usually incorporate elements from the original 'My Hero Academia' universe, like their hero training and the challenges they face at school.